package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.gulimall.cart.to.UserInfoTo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import com.atguigu.common.vo.MemberResponseVo;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 在执行目标方法之前，判断用户的登录状态.并封装传递给controller目标请求
 * @author weichen
 * @email 519543138@qq.com
 * @date 2022-11-21 上午11:57
 */
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal=new ThreadLocal<>();

    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();

        HttpSession session=request.getSession();
        //获得当前登录用户的信息
        MemberResponseVo member= (MemberResponseVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(member!=null){
            userInfoTo.setUserId(member.getId());
        }

        Cookie[] cookies = request.getCookies();
        for (Cookie c: cookies) {
            String name = c.getName();
            if(CartConstant.TEMP_USER_COOKIE_NAME.equals(name)){
                userInfoTo.setUserKey(c.getValue());
                //标记为已是临时用户
                userInfoTo.setTempUser(true);
            }
        }

        //如果没有临时用户一定分配一个临时用户
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid=UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }


        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 业务执行之后，分配临时用户来浏览器保存
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        //如果没有临时用户一定保存一个临时用户
        if(!userInfoTo.getTempUser()){
            Cookie cookie=new Cookie(CartConstant.TEMP_USER_COOKIE_NAME,userInfoTo.getUserKey());
            //作用域
            cookie.setDomain("gulimall.com");
            //过期时间
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
